That photo shows a 1970 Kingsway Hall session for the EMI recording of Vaughan Williams' The Pilgrim's Progress . From left to right are Ursula Vaughan Williams, Christopher Bishop (producer), Sir Adrian Boult , John Noble , Ian Partridge, Gloria Jennings, Christopher Parker (balance engineer), John Alldis (chorus master), Sheila Armstrong and Marie Hayward. During his career at EMI Christopher Bishop produced legendary recordings with Sir John Barbirolli, André Previn, Sir David Willcocks , David Munrow, Carlo Maria Giulini, Sir Adrian Boult and many others. Christopher was born on April 1st 1931; he is enjoying a well-earned retirement in rural Suffolk not far from Aldeburgh, and I am sure readers will join me in wishing him a very happy birthday. It is a scandal that in an age when so many minor media celebrities receive recognition with State honours that Christopher Bishop's contribution to British and indeed global culture has never been recognised with a suit
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But I'm afraid it is not St. Theresa. She was busy with rehearsals when the photo was taken.
Yes, the mystery lady was Arianna Stassinopoulos, now Arianna Huffington.
She was an item with Bernard Levin for quite a while, and John Tavener dated her sister Agape.
http://www.overgrownpath.com/2006/12/arianna-huffingtons-classical-music.html
For completeness the other party people, from left to right, are Michael Hastings, Angela Huth, Josceline Dimblebey and Gaia Servadio,